NLogLoggingConfiguration Reload now fully support KeepVariablesOnReload

[snakefoot]

Resolves #466

[codecov-commenter]

Codecov Report

Merging #522 (631e911) into master (e2bffa9) will increase coverage by 0.47%.
The diff coverage is 70.37%.

@@            Coverage Diff             @@
##           master     #522      +/-   ##
==========================================
+ Coverage   79.95%   80.43%   +0.47%     
==========================================
  Files          17       17              
  Lines        1452     1416      -36     
  Branches      236      231       -5     
==========================================
- Hits         1161     1139      -22     
+ Misses        184      175       -9     
+ Partials      107      102       -5     

Impacted Files	Coverage Δ
...Extensions.Logging/Logging/NLogBeginScopeParser.cs	67.42% <65.32%> (+1.25%)	⬆️
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	81.75% <72.22%> (+0.19%)	⬆️
...tensions.Hosting/Extensions/ConfigureExtensions.cs	85.71% <100.00%> (+0.42%)	⬆️
...ensions.Logging/Config/NLogLoggingConfiguration.cs	89.87% <100.00%> (+0.21%)	⬆️
...g.Extensions.Logging/Logging/NLogLoggerProvider.cs	98.27% <100.00%> (+3.03%)	⬆️
....Extensions.Logging/Logging/NLogProviderOptions.cs	100.00% <100.00%> (ø)
...tensions.Logging/Targets/MicrosoftILoggerTarget.cs	84.07% <100.00%> (+0.42%)	⬆️

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